Programmed Data Processor, a series of influential computers made by Digital Equipment Corporation from the 1960s-1990s.
Acronym coined by Digital Equipment Corporation in 1957. 'Programmed Data Processor' was chosen instead of 'computer' because DEC's management thought 'computer' sounded too expensive and intimidating to potential customers.
The PDP series, especially the PDP-11, fundamentally shaped modern computing architecture. Many concepts we take for granted in computers today - like virtual memory and hierarchical file systems - were pioneered or perfected on PDP machines.
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